#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
+#include "pci.h"
#define PFAULT_INIT 0x0600
#define PFAULT_DONE 0x0680
{
if (!gib)
return;
+ if (kvm_s390_pci_interp_allowed() && aift) {
+ mutex_lock(&aift->aift_lock);
+ kvm_s390_pci_aen_exit();
+ mutex_unlock(&aift->aift_lock);
+ }
chsc_sgib(0);
unregister_adapter_interrupt(&gib_alert_irq);
free_page((unsigned long)gib);
goto out_unreg_gal;
}
+ if (kvm_s390_pci_interp_allowed()) {
+ if (kvm_s390_pci_aen_init(nisc)) {
+ pr_err("Initializing AEN for PCI failed\n");
+ rc = -EIO;
+ goto out_unreg_gal;
+ }
+ }
+
KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
goto out;
#include <linux/kvm_host.h>
#include <linux/pci.h>
+#include <asm/pci.h>
+#include <asm/pci_insn.h>
#include "pci.h"
+struct zpci_aift *aift;
+
+static inline int __set_irq_noiib(u16 ctl, u8 isc)
+{
+ union zpci_sic_iib iib = {{0}};
+
+ return zpci_set_irq_ctrl(ctl, isc, &iib);
+}
+
+void kvm_s390_pci_aen_exit(void)
+{
+ unsigned long flags;
+ struct kvm_zdev **gait_kzdev;
+
+ lockdep_assert_held(&aift->aift_lock);
+
+ /*
+ * Contents of the aipb remain registered for the life of the host
+ * kernel, the information preserved in zpci_aipb and zpci_aif_sbv
+ * in case we insert the KVM module again later. Clear the AIFT
+ * information and free anything not registered with underlying
+ * firmware.
+ */
+ spin_lock_irqsave(&aift->gait_lock, flags);
+ gait_kzdev = aift->kzdev;
+ aift->gait = NULL;
+ aift->sbv = NULL;
+ aift->kzdev = NULL;
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+
+ kfree(gait_kzdev);
+}
+
+static int zpci_setup_aipb(u8 nisc)
+{
+ struct page *page;
+ int size, rc;
+
+ zpci_aipb = kzalloc(sizeof(union zpci_sic_iib), GFP_KERNEL);
+ if (!zpci_aipb)
+ return -ENOMEM;
+
+ aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, 0);
+ if (!aift->sbv) {
+ rc = -ENOMEM;
+ goto free_aipb;
+ }
+ zpci_aif_sbv = aift->sbv;
+ size = get_order(PAGE_ALIGN(ZPCI_NR_DEVICES *
+ sizeof(struct zpci_gaite)));
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, size);
+ if (!page) {
+ rc = -ENOMEM;
+ goto free_sbv;
+ }
+ aift->gait = (struct zpci_gaite *)page_to_phys(page);
+
+ zpci_aipb->aipb.faisb = virt_to_phys(aift->sbv->vector);
+ zpci_aipb->aipb.gait = virt_to_phys(aift->gait);
+ zpci_aipb->aipb.afi = nisc;
+ zpci_aipb->aipb.faal = ZPCI_NR_DEVICES;
+
+ /* Setup Adapter Event Notification Interpretation */
+ if (zpci_set_irq_ctrl(SIC_SET_AENI_CONTROLS, 0, zpci_aipb)) {
+ rc = -EIO;
+ goto free_gait;
+ }
+
+ return 0;
+
+free_gait:
+ free_pages((unsigned long)aift->gait, size);
+free_sbv:
+ airq_iv_release(aift->sbv);
+ zpci_aif_sbv = NULL;
+free_aipb:
+ kfree(zpci_aipb);
+ zpci_aipb = NULL;
+
+ return rc;
+}
+
+static int zpci_reset_aipb(u8 nisc)
+{
+ /*
+ * AEN registration can only happen once per system boot. If
+ * an aipb already exists then AEN was already registered and
+ * we can re-use the aipb contents. This can only happen if
+ * the KVM module was removed and re-inserted. However, we must
+ * ensure that the same forwarding ISC is used as this is assigned
+ * during KVM module load.
+ */
+ if (zpci_aipb->aipb.afi != nisc)
+ return -EINVAL;
+
+ aift->sbv = zpci_aif_sbv;
+ aift->gait = (struct zpci_gaite *)zpci_aipb->aipb.gait;
+
+ return 0;
+}
+
+int kvm_s390_pci_aen_init(u8 nisc)
+{
+ int rc = 0;
+
+ /* If already enabled for AEN, bail out now */
+ if (aift->gait || aift->sbv)
+ return -EPERM;
+
+ mutex_lock(&aift->aift_lock);
+ aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev),
+ GFP_KERNEL);
+ if (!aift->kzdev) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
+
+ if (!zpci_aipb)
+ rc = zpci_setup_aipb(nisc);
+ else
+ rc = zpci_reset_aipb(nisc);
+ if (rc)
+ goto free_zdev;
+
+ /* Enable floating IRQs */
+ if (__set_irq_noiib(SIC_IRQ_MODE_SINGLE, nisc)) {
+ rc = -EIO;
+ kvm_s390_pci_aen_exit();
+ }
+
+ goto unlock;
+
+free_zdev:
+ kfree(aift->kzdev);
+unlock:
+ mutex_unlock(&aift->aift_lock);
+ return rc;
+}
+
static int kvm_s390_pci_dev_open(struct zpci_dev *zdev)
{
struct kvm_zdev *kzdev;
zdev->kzdev = NULL;
kfree(kzdev);
}
+
+int kvm_s390_pci_init(void)
+{
+ aift = kzalloc(sizeof(struct zpci_aift), GFP_KERNEL);
+ if (!aift)
+ return -ENOMEM;
+
+ spin_lock_init(&aift->gait_lock);
+ mutex_init(&aift->aift_lock);
+
+ return 0;
+}
+
+void kvm_s390_pci_exit(void)
+{
+ mutex_destroy(&aift->aift_lock);
+
+ kfree(aift);
+}
#include <linux/kvm_host.h>
#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <asm/airq.h>
+#include <asm/cpu.h>
struct kvm_zdev {
struct zpci_dev *zdev;
struct kvm *kvm;
};
+struct zpci_gaite {
+ u32 gisa;
+ u8 gisc;
+ u8 count;
+ u8 reserved;
+ u8 aisbo;
+ u64 aisb;
+};
+
+struct zpci_aift {
+ struct zpci_gaite *gait;
+ struct airq_iv *sbv;
+ struct kvm_zdev **kzdev;
+ spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
+ struct mutex aift_lock; /* Protects the other structures in aift */
+};
+
+extern struct zpci_aift *aift;
+
+int kvm_s390_pci_aen_init(u8 nisc);
+void kvm_s390_pci_aen_exit(void);
+
+int kvm_s390_pci_init(void);
+void kvm_s390_pci_exit(void);
+
+static inline bool kvm_s390_pci_interp_allowed(void)
+{
+ struct cpuid cpu_id;
+
+ get_cpu_id(&cpu_id);
+ switch (cpu_id.machine) {
+ case 0x2817:
+ case 0x2818:
+ case 0x2827:
+ case 0x2828:
+ case 0x2964:
+ case 0x2965:
+ /* No SHM on certain machines */
+ return false;
+ default:
+ return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
+ sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
+ sclp.has_aisii);
+ }
+}
+
#endif /* __KVM_S390_PCI_H */
projects / platform / kernel / linux-rpi.git / commitdiff